Semantic repetition refers to adding a word with the same or similar meaning to the head word before or after a head word, which often leads to semantic repetition because of the redundancy of a certain component in a sentence. For example: 1, "An Shi Rebellion" led to the destruction of people's lives. "untold sufferings" means that the people are in extremely difficult situation. This is the urgent task at present. ("the most important thing" refers to the current important thing or work).